Lots of 'young skulls full of mush' in those areas, which probably doesn't help.
On Blue vs. Red maps of California counties, my original home county is shown as light blue. It's very rural, with lots of farmers, who tend to be conservative, but UC Davis is in the county, a
Blue blot outnumbering the more sensible farmers and businesspeople (the population of Davis is ~65K, that of the county seat, nearby Woodland, is ~61K).